English: This image shows the decline in annual electricity generation at Hoover dam since year 2000. Installed generating capacity is equally split between the states of Arizona and Nevada. Total electricity generation for the two states in any year is not equal.

Data is from the U.S. Energy Information Administration:
(Arizona) https://www.eia.gov/electricity/data/browser/#/plant/8902/?freq=A&pin=
(Nevada) https://www.eia.gov/electricity/data/browser/#/plant/154/?freq=A&pin=

Year Total Mwh Arizona Nevada
2020 3449073 1582003 1867070
2019 3331912 1156197 2175715
2018 3541194 1726548 1814646
2017 3392154 1653271 1738883
2016 3566734 1818612 1748122
2015 3650496 1401847 2248649
2014 3789087 1436779 2352308
2013 3870074 1245441 2624633
2012 3964853 1590705 2374148
2011 3641508 1523403 2118105
2010 3614565 1517486 2097079
2009 3681723 1275028 2406695
2008 3741837 2032142 1709695
2007 3746685 1787092 1959593
2006 3922864 1902835 2020029
2005 3548221 1879235 1668986
2004 3858072 2276988 1581084
2003 3934986 2233490 1701496
2002 4624958 2400017 2224941

2001 4811736 2358208 2453528